These days most celebrities have some kind of social media they use to promote new projects and/or give fans small glimpses of their lives. There are even those, like the Kardashians and Jenners, who have taken their social media game and turned it into an art form. They often aspire fans to model their own profiles after them.

There are, however, those Hollywood A-listers who do not see the benefits of social media and therefore have mostly stayed away. Stars like Scarlett Johansson and Emma Stone don’t necessarily want to share every moment of their lives with the Internet, while others like Benedict Cumberbatch, Keira Knightley and Angelina Jolie feel they aren’t tech savvy enough to be effective at it.

Then there are celebrities like Kristen Stewart and Jake Gyllenhaal who see social media—and smartphones in general—as a way of losing personal connectivity with others, while celeb parents like Kate Winslet and Sandra Bullock ban social media from their homes because of its potential negative impact on their kids’ self-worth.

Here are 15 stars that have decided to stay away from social media and some lessons you can learn from them.

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1. JENNIFER LAWRENCE

The Oscar winner has been pretty much off social media from the start. She'll appear in other people's Instagram posts, like when doing press with pal Chris Pratt, but when it comes to her own accounts, it's a no-go.

She has her reasons: Jennifer once told BBC Radio, “I will never get Twitter. I’m not very good on the phone or technology. I cannot really keep up with emails so the idea of Twitter is so unthinkable to me … If you ever see a Facebook, Instagram or Twitter that says it’s me, it most certainly is not … I had [the answer to that question] locked and loaded … Because the Internet has scorned me so much. And I feel like I’m that girl in high school like, ‘You wanna talk about her? Yeah, I’ll do that!’ Take my hoops off, I’m ready to go.”

What are some lessons learned: The actress feels like she gets enough flak from haters on the Internet, so why open herself up even more? Fair point.

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2. EMMA STONE

Like her BFF Jennifer Lawrence, the La La Land star has stayed off social media, though once toyed with the idea of having a Twitter account. Ultimately, she didn't need the validation.

She has her reasons: “It’s that need to be liked,” she explained during a chat for the Los Angeles Times and EPIX's five-part TV series Hollywood Sessions. “That need to be seen, that need to be validated, in a way, through no one that you know...It's this very modern 'keeping up with the Joneses.' It's almost impossible to find someone that's not, in some way, on the Internet...Every time I talk about social media, I forget where I'm going. I go into a rabbit hole."

What are some lessons learned: If you want to get a glimpse of what fame feels like, social media is it. Emma added, “It seems like everybody knows what that feels like. It seems like everyone’s cultivating their lives on Instagram or on different forms of social media, and what pictures looks best of their day.”

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3. BRADLEY COOPER

The actor, who marks his directorial debut with a remake of A Star Is Born (in which he also stars along with Lady Gaga) is a little “old-fashioned” when it comes to social media and feels like it sometimes takes away from being an actor.

He has his reasons: “I see the benefit of it [social networking] for sure,” he once explained on British OK! TV. “It’s a great way to promote ideas and projects. For me, maybe I’m old fashioned, if I know so much about you and you’re playing a character in a movie then that’s a lot of work I’m gonna have to do to forget who you are so that I can believe the character and therefore enjoy the movie.”

What are some lessons learned: When using social media, you do put yourself out there a lot, so if you're wanting to keep a little mystery about yourself, you might want to be more selective.

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4. SCARLETT JOHANSSON

Scarlett Johansson, whose latest Marvel movie Avengers: Infinity War is a smash hit at the box office, doesn't really see the benefits of sharing her life online.

She has her reasons: “I don’t have a Facebook or a Twitter account,” she once toldInterview magazine. “And I don’t know how I feel about this idea of, ‘Now, I’m eating dinner, and I want everyone to know that I’m having dinner at this time,’ or ‘I just mailed a letter and dropped off my kids.’ That, to me, is a very strange phenomenon. I can’t think of anything I’d rather do less than have to continuously share details of my everyday life.”

What are some lessons learned: Oversharing can be a big turn off on social media, so watch for that.

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5. KRISTEN STEWART

The former Twilight star really doesn't think social media is at all useful for her. She'd rather have that more personal connection.

She has her reasons: Kristen Stewart told V magazine, “When you speak to someone on the phone, that is a decipherable, understandable exchange. But with text and social media, it’s essentially a dialogue with yourself and your interpretation of a shadow. It’s not invalid; it’s a new language...But you also become addicted to that hit by yourself and with yourself, every seven minutes or so, and you end up wasting so much time just validating something very superficial in yourself. It has definitely changed us.”

What are some lessons learned: Social media can be an enormous time suck. Like Emma Stone mentioned above, you can go down a rabbit hole quite quickly. “I know I sound ridiculous and really obvious,” Kristen once said toHarper’s Bazaar, “... but we could be doing way cooler s***. It’s so time-consuming."

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6. BENEDICT CUMBERBATCH

Even though he is definitely one of the best celebrity photo-bombers of all time, Cumberbatch feels he'd be a “disaster” at tweeting.

He has his reasons: “I can’t get involved in social media because as they know, it’d be a disaster,” the Dr. Strange star toldPeople. “I can’t tweet to save my life. I’d go over my character limits and never make any sense. It would just consume me and I find that whole thing ultimately very toxic. I’d much rather spend my energy doing what brought me to their attention in the first place, which is my work.”

What are some lessons learned: Obsessing over just the right thing to say in 280 characters can be daunting. Don't try to force it if you're not feeling it.

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7. MILA KUNIS

For the Bad Moms actress, privacy is a big priority, especially as a mom of two, so social media can't be a part of her routine. She does, however, from time to time pop up on husband Ashton Kutcher's Instagram account, like here.

She has her reasons: “What I do and who I am are two different things,” she once explained to The Daily Telegraph, “and to me, it was always really important to keep those things separate. I don’t want people thinking they know me to the point where they feel comfortable coming in my house without being invited. For security reasons, it just wasn’t worth it. I’d rather have my privacy over anything.”

What are some lessons learned: You certainly can understand where Kunis is coming from. There is a certain intimacy a fan may get when they follow their favorite celebrities on social media, but they really aren't your friend. Be respectful.

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8. AMY POEHLER

Although you might wish Amy Poehler were on Twitter, just to read all the hilarious things she might tweet about today's world, it's not going to happen. The former Parks and Recreation star doesn't like to read stuff online, either, and would rather concentrate on her girl-empowering website, Smart Girls.

She has her reasons: Of course, how Poehler explains why she isn't on social media is hysterical enough. She toldPaper magazine, “I try not to read too much online because I always get my feelings hurt, even if someone’s flattering you. Like somebody tweeting, ‘Call me crazy, but I think Amy Poehler’s attractive.’ And you’re like, ‘Okay? Thank you?’ Or like someone writing, ‘I’m gonna go out on a limb and say that I’d have sex with Amy Poehler.’ ”

What are some lessons learned: Bottom line, don't be a Twitter troll.

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9. KEIRA KNIGHTLEY

The lovely British actress once had a Twitter account but deleted it because she didn't feel like being in a popularity contest.

She has her reasons: "I did actually join Twitter for about 12 hours because I tried to be down with the kids and it just creeped me out," Knightley said on The Jonathan Ross Show. "I didn't post anything and I was under a false name... I just got completely freaked out." Knightley also once told Harper’s Bazaar UK (via Daily Mail). “It made me feel a little bit like being in a school playground and not being popular and standing on the sidelines kind of going, ‘Argh,'”

What are some lessons learned: The former Pirates of the Caribbean star has a point. Social media most definitely can be competitive--how many followers you have, how many likes--and can leave you feeling dejected. But don't let it. Even if you have one follower, if you have fun with your social media, that's all that counts.

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10. KATE WINSLET

The British Oscar winner does not have any social media accounts, and she makes sure her kids don't use have any either because of the way it might affect their self-worth.

She has her reasons: “It has a huge impact on young women's self-esteem because all they ever do is design themselves for people to like them," Winslet once toldThe Sunday Times. "And what comes along with that? Eating disorders. And that makes my blood boil. And is the reason we don't have any social media in our house.”

What are some lessons learned: It is important for kids to do more than just be on their phones. As Winslet added, “Let your kids climb trees. Take the device out of their hand. Play Monopoly!...It takes every member of a family to be a member, and there are too many interruptions these days – and devices are a huge interruption."

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1. ANGELINA JOLIE

Although when they were together, there was a wish by fans that Angelina Jolie and Brad Pitt would join the social media club, they never quite got the swing of it and mostly stayed away. Now, even though they've split, it's still pretty much the same deal.

She has her reasons: Jolie admitted toPeople she and Pitt just didn't understand it all that well. “It’s so beyond what we understand. We wouldn’t even know what to look for.” Jolie and Pitt also wanted to protect their six children from any scrutiny that might occur from having social media.

What are some lessons learned: Jolie is definitely happy there were no smartphones when she was young and wild. “I got in enough trouble. It just would have been very documented.” That is something young Hollywood starlets have to contend with these days and learn the pros and cons.

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12. SANDRA BULLOCK

The actress, who is starring in the upcoming heist film Ocean's 8, doesn't believe in social media, especially when it comes to taking selfies.

She has her reasons: “I hate taking selfies,” she told U.K.’s The Times. “I will not take a selfie that I can’t erase. I don’t post or do any of that stuff.”

What are some lessons learned: Bullock believes selfies are "not representing our lives truthfully. Like when you’re yelling at your child, you’re not taking a selfie of you being a horrible parent. No, you’re waiting for the perfect selfie. ‘Do I look thinner now?’ ‘Do I look great?’ It’s this false projection of one’s life. Hollywood has now gone global. Everyone’s Hollywood now.”

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13. JAKE GYLLENHAAL

The Hollywood A-lister is another who has shunned social media and is very glad iPhones weren't around when he was a teenager. But he does think it's “scary” how teenagers are addicted to their smartphones.

He has his reasons: Gyllenhaal toldUSA Today, “To me, this is a product of us all having smartphones and being consumed by that -- we're looking down. No one is looking up. I take that seriously, even in the midst of being funny. I think it's saying something really important and a little scary.”

What are some lessons learned: Attention spans are growing shorter and shorter, so put the smartphone down every once in awhile and look up at the sky.

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14. DAISY RIDLEY

The Star Wars actress was active on her Instagram and Twitter but deleted her accounts in 2017 after receiving backlash for sharing a post about victims of gun violence.

She has her reasons: Ridley described social media as damaging to mental health, especially for teenagers. “It’s such a weird thing for young people to look at distorted images of things they should be,” she said to Radio Times. “Life suddenly got a bit different. I’m definitely recognize more, but I find the whole taking pictures thing weird. I’d prefer to have a conversation than someone asking for a picture, but I guess people feel the need to prove they’ve had the interaction through social media.”

What are some lessons learned: The actress does bring up a good point about being famous. While some celebrities don't mind when you ask for a selfie, others might so be respectful.

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15. GEORGE CLOONEY

The Hollywood movie star isn't at all interested in being on social media, partly because he's afraid what might happen if he gets inebriated and decides to let loose on Twitter.

He has his reasons: Clooney explained toEsquire magazine, “I don’t understand why any famous person would ever be on Twitter. Why on God’s green earth would you be on Twitter? Because first of all, the worst thing you can do is make yourself more available, right? Because you’re going to be available to everybody. But also Twitter. So one drunken night, you come home and you’ve had two too many drinks and you’re watching TV and somebody pisses you off, and you go ‘Ehhhhh’ and fight back. And you go to sleep, and you wake up in the morning and your career is over... Or all the things you might think in the quiet of your drunken evening are suddenly blasted around the entire world before you wake up.”

What are some lessons learned: That's simple. Try not to tweet when you've been drinking.